Drawing-press.



No. 883,021. PATBNTED MAR. 24, 1908.

H. J. HINDE.

DRAWING PRESS.

APPLIOATIQN Immun. 19,1901.

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PATENTBD MAR. 24, 1808.

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APPLICATION FILED APR.19,1907.

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l PATENTED MAR. 24, 1908. H. J. HINDE.

DRAWING PRESS.

APPLIoA'rIoN FILED un; 19, 1907.

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UNITED STATES PATENT OEEIOE.

HENRY J. I-IINDE, OF TOLEDO, OHIO, ASSIGNOR TO THEuTOLEDO MACHINE & TOOLCOMPANY, OF TOLEDO, OHIO.

DRAWING-Pansa Specification of Letters Patent.

Patented' March 24, 1908.

Application filed April 19, 1907. Serial No. 369,175.

T 0 all whom it may concern:

to the following description and to the accom- Be it known that I, HENRYJ. HINDE, a panying drawings, in which,-

citizen ofthe United States, and ya resident Figure 1 is a frontelevation of the maof Toledo, in the county of Lucas and State chineembodying the features of my invenof Ohio, have invented certain new anduseful Improvements in Drawing-Presses; and I do hereby declare thefollowing to be a full, clear, and exact description of the invention,such as will enable others skilled in the art to which it appertains tomake and use the same, reference being had to the accompanying drawings,and to the figures of reference marked thereon, which form a part ofthis specification.

My invention relates to drawing or forming presses of the class whereinthe blank or sheet to be operated on is first gripped against the rim ormargin of thedie by a blank-holder and held firmly in position duringthe drawing or forming operation of the plunger. A

In this class -of presses the blank-holder and plunger usually have therequisite differential movements communicated thereto from a commoncrank-shaft through the medium of various arrangements of toggles,levers, cam-mechanism, or the like, thus making it impossible to moveeither without moving the other of said parts. Numerous objections areincident to this method of communicating motion to the blank-holder andplunger, due principally to the complex nature of the connectingmechanism and to the fact that it is frequently necessary in order tocompletely form and finish the work, where it is of especially heavynature,

to give repeated strokes of the plunger thereto before releasing theblank-holder to permit a removal of the work.

The primary object of my invention is to obviate the difficultiesincident to the use of the presses of this class heretofore employed, bythe provision, in a press of this kind, of simple and highly efficientmechanism for imparting entirely independent movements to theblank-holder and plunger, whereby they may be moved in unison orseparately at the will of the operator, and they plunger given repeatedstrokes or movements for the purpose of completely forming or finishingthe work before the same is released by the holder.

Further objects of the invention, as well as the operation, constructionand arrangement of the parts thereof, will appear by reference tion,with both the work-holder and forming plunger in lowered position.elevation thereof. Fig. 3 is a vertical transverse section of theblank-holder on the dotted line 3 3 in Fig. 1. Fig. 4 isa partial sideelevation of the machine showing the position of the piston-rod .andconnected toggle-arms of the,blank-holder when the latter is in raisedor inoperative position. Fig. 5 is a centraltransverse vertical sectionof the 'machine showing the blank-holder raised and the plunger lowered,and Fig. 6 is a horizontal section on the dotted line 6 6 in Fig. 1.

Referring to the drawings, 7 designates a fixed frame of suitableconstruction forming the bearings for the working parts, and having abed or bolster 8 at its base to which the female die or matrix 9 isfixed. The blankholder 10, which, when lowered, cooperates with themarginal surface portion ofn the ma'- trix 9 to hold the work, has itsvertical movement suitably guided by the fr ame sides, and is suspendedfrom the two parallel rockshafts 12, 12 by means of the sets oftogglearms 13 and 14, the former of which, are fixed to their respectiveshafts while the latter have their lower ends pivoted to theblank-holders, as at 15. At one side of the frame 7 is disposed avertical cylinder 16 carrying a piston 17, the piston-rod 18 of whichprojects from the upper end thereof and operates in guides 19 secured tothe frame side. This rod carries a collar or enlargement 20, which isoperatively connected to the two shafts 12 by the links 21 andcrank-arms 22, thus providing toggle connection between the piston-rodand said shafts whereby a movement of the former will rock the shaftsand effect a raising or lowering of the blank-holder. The actuatingfluid, whether it be steam, compressed air or hydraulic pressure, isadmitted to the chest 23 of the cylinder 16 through the pipe 24 and isexhausted through the pipe 25, such admission being controlled by thevalvelever 26, while the admission of fluid to the cylinder foroperating `the piston is controlled by the cylinder-valve lever 27. Itis understood that these valves may be of any suitable construction. Thepress-plunger 28,

Fig. 2 is a side having a forming-head 29 suitable to the l ger israised and brought to rest at its highest matrix 9, is carried at thelower end of a piston-rod 30, which is suspended from and moves with apiston-head 31 operating in the vertical cylinder 32 on the top of theframe 7. This plunger operates through a registering opening 11 in theblank-holder 10 and is provided with guides 33, which move inguide-grooves 34 provided in the blankholder at the ends of saidopening. The admission of actuating fluid to the chest 35 of thecylinder 32 is controlled by the lever 36, and the admission of .fluidto the cylinder from its chest is controlled by the cylindervalve lever37, both of which levers connect with their valves through suitableintermediate mechanism, as shown in Figs. 1 and 2.

The operation of the press is as follows z- The work being placed on thematrix 9, the valve-lever 27 1s operated to admit the actuating fluid tothe p roper end of the cylinder 16 to effect a raising of the piston 17and attached parts from the normal position shown in Fig. 4,.and aconsequent rocking of the shafts 12, 12 and lowering of the blankholder10 to clamp the work tov the matrix. When the blank-.holder is loweredthe toggles 13 and 14 are straightened as shown in Figs. 1, 2l and 3 andlock the holder in lowered position. The work having been clamped by theblank-holder, the plunger 28, which is normally elevated, is set inmotion, to form or draw the blank into the desired shape, by moving thecylinder-valve lever 37 in the proper direction to admit the fluid abovethe piston 31 in the cylinder 32, thereby forcing the piston andattached parts down and causing the forming head to operate on the work.The plunger after making its downward stroke is elevated, either to.repeat the stroke or to enable the work to be removed, by reversing theposition of the lever 37, thus admitting fluid below the piston andforcing it to` its normal elevated position. On the completion of theforming operation the position of the lever 27 is reversed to admit theactuating agent to the cylinder 16 above its piston, thus forcing thepiston downward to operate the toggles 21 and 22 to rock the shafts 12in the proper direction to elevate the blank-holder 10 through themovement imparted to the toggles 13 and 14, and release the work topermit its removal from the press.

It is thus apparent that I have provided a drawing or toggle-press whichis provided with entirely independent means for controlling themovements of the blank-holder and forming-plunger thereof, whereby saidparts may be worked simultaneously or separately as desired, andpermitting repeated strokes or movements of the plunger to finish thework during a continuous engagement thereof 'by the blank-holder, afterwhich the plunstroke and the blank-holder then raised to release thework and brought to rest at its highest stroke. This feature is of theutmost importance in machines of this class as the movements of theplunger and blankholder are thereby placed absolutely under the controlof the operator and may be moved in unison, as has heretofore been thepractice, or separately as the nature or condition of the Work mayrequire.

While I have shown and described a particular construction andarrangement of the parts of the features of my invention, I desire it tobe understood that I do not restrict myself to such construction orarrangement, as obvious modifications will occur to a person skilled inthe art.

Having thus described my invention, what I claim as new and desire tosecure by Letters Patent, is,- v

1. In a press of the class described, a frame, a blank-holder verticallymovable in the frame, a forming plunger adapted to work downwardlythrough the blank-holder in its forming operation, a cylinder at the topof the frame, a piston mounted in the cylinder, a piston-rod projectingdownwardly from the piston and carrying the forming plunger at its lowerend, a second cylinder mounted at the side of the frame, a pistonoperating therein, a piston-rod projecting upwardly from said latterpiston, a pair of rock-shafts journaled transversely of the frame andhaving cranks projected therefrom and connected to said latterpiston-rod, toggle-connection between the rock-shafts and blank-holder,and independent means associated with each cylinder for controlling themovement of the pistons.

2. In a press of the class described., a frame, a vertically-disposedcylinder at the top of the frame, a piston mounted in said cylinder, apiston-rod projecting downwardly from the piston, a forming plungercarried at the lower end of the rod, a secondl vertically-disposedcylinder carried at the side of the frame, a piston operating therein, apiston-rod projecting from the piston, a blank-holder movable in theframe and having an opening through which the plunger works, togglemechanism connecting said latter rod and blank-holder to impart movementfrom one to the other, and independent means associated with eachcylinder for controlling the movements of the pistons.

In testimony whereof I have hereunto signed my name to thisspecification in the presence of two subscribing witnesses.

HENRY J. I-IINDE.

Witnesses:

HAZEL B. HIETT, CORNELL SCHREIBER.

